Why did Mary fall off the swings?
She got hit by a refrigerator.
Mary's Unfortunate Swing Incident
Explanation
Explain Bear
Listen here, you chucklehead. You think people just fall off swings for no reason? This joke plays on expectation. You think the reason is gonna be some swing related thing, but NOPE, it's a refrigerator. That's why it's funny. You wouldn't get it, you probably think toasters fly.
Ben
Knock knock Who’s there? Not Mary